Inductor dynamo-electric machine.



No. 640,760. Patented Jan. 9, 1900. H. GEISENHONER.

lNDUCTOR DYNAMO GTRIC MACHINE.

pplication file v. 14, 1898.)

(No Model.)

iNVEN U 1*[enr (leis enb'o'ner. M 4% UNITED STATES PATENT OFFICE.

HENRY eEIsENnoNEE, or SOHENEOTADY, NEW YORK, ASSIGNOR TO THE GENERALELECTRIC COMPANY, on NEW YORK.

lNDUCTOR DYNAMO-ELECTRIC MACHINE.

SPECIFICATION forming part of Letters Patent No. ,7 dated January 9,1900- Application filed November 14,1898. Serial No. 696,333. (Nomodel.)

To ctZZ whom it may concern:

Be it known that I, HENRY GEIsENHoNEE, a citizen of the United States,residing at Schenectady, in the county of Schenectady, State of NewYork, have invented certain new and useful Improvements inInductor-Dynamos, (Case N0. 482,) of which the following is aspecification.

My present invention relates to the con struction of inductor-dyna mos,and more particularly to the revolving inductor of such machines. Inpractice these machines are sometimes driven at very high speeds, and ithas been found that they set up a very disagreeable howl or vibration.Many attempts have been made to remedy this difficulty, some of whichhave lessened it, but none of which have been entirely successful. Ithas been due to a great extent to the shape of the inductor, which setsup harmonic vibrations in its revolutions. It is the object of thepresent invention to prevent this by building out the inductor to asubstantially cylindrical form with materials to some extent at leastnon-resonant in character. It is manifest that most materials exceptmetals are unsafe on account of the centrifugal stress to which thesestructures are subjected. I prefer, therefore, to build the iron part ofthe inductor of the usual laminated construction and attach it to asolid metallic body, filling the cut-awaypart of the iron structure withlaminations of brass and some non-resonant insulating material, such ascompressed fiber. By this arrangement I am enabled to check to a greatextent harmonic vibration, so that the noise from the alternator isminimized and in machines of ordinary sizes eliminated. At the same timeby dovetailing the parts together I get a structure which is capable ofenduring the strain of the highest speeds used in these machines.

The accompanying drawings show my invention.

Figure 1 is a section of an inductor-alternator with a part of therevolving inductor shown in side elevation, and Fig. 2 a section throughthe revolving inductor.

In Fig. 1, A. is the shaft of the machine, of which Bis thearmature-frame. M is one of the armature-coils, C C the field-magnetwinding, and D is the armature-iron. These parts are old and of anywell-known construction.

The revolving inductor consists of a solid approximately cylindricalbody of metal G, to which the inductonpoles E are secured by dovetailsand the usual end plates F F and rings II threaded upon the body G. At 1I are shown the non magnetic laminations, which are preferably of brassor gun-metal and are separated by insulation, such as hard fiber K. I

The configuration of the different parts will be better understood fromFig. 2, in which E is one of the laminations of the inductoriron,provided with dovetails e e, which mesh with a similar construction onthe inductorbody G The brass or gunmetal plates I are also provided withdovetails 't', which fit into proper grooves on the inductor-body andinto the pole-pieces. To lessen the Weight and the consequentcentrifugal strain, openings t" t" are made in the brass and fiberplates. These openings also serve to still further eliminateeddy-currents and to cool the in ductor.

\Vhat I claim as new, and desire to secure by Letters Patent of theUnited States, is-

l. The combination with an inductor having radial pole-pieces, of alight, hollow, nonmagnetic cooling structure secured to the indoctor,and filling the spaces between the pole-pieces to present with thelatter a substantially cylindrical surface.

2. A rotatable inductor with radially-extending pole-pieces and providedwith alternate layers of non-magnetic metal and nonresonant insulation,which fill the spaces between the pole-pieces.

3. In an inductor, the combination ofa supporting-core, laminated polessecured to the core, and intervening plates of alternate insulatingmaterial and non-magnetic metal secured to the core and filling out thespace between the poles so that the envelop of the inductor issubstantially a cylinder.

4. The combination in an inductor, of the supporting-core, the laminatediron forming the pole-pieces dovetailed to the core, and the plates ofnon-magnetic metal, such as brass,

IOO

and of insulation, dovetailed to the core and the pole-pieces; the wholeforming substantially a cylinder.

5. The combination with an inductor having radial pole-pieces, ofnon-magnetic material interlocked with the inductor structure andfilling the spaces between the polepieces.

6. A rotatable inductor comprising a separate core, radial pole-pieces,and non-magnetic material interlocked with said core and pole-pieces andfilling the spaces between the poles.

7. A rotatable inductor comprising a separate core,pole-piecessecuredthereto,and nonmagnetic material secured to the core and filling thespaces between the pole-pieces.

8. A rotatable inductor comprising a separate core,-pole-pieces securedthereto,and non- In witness whereof I have hereunto set my hand this12th day of November, 1898.

HENRY enisnnnonna.

\Vitnesses:

B. B. HULL, EDW. WVILLIAMS, J12

